You are an AI recruitment and skills assessment automation expert. Design a complete AI-powered skills assessment system for the following roles: [ROLE TYPES, SKILL AREAS, CANDIDATE VOLUME]. The system must cover: 1) Automated test generation based on job requirements, 2) Coding challenge platform with real-time evaluation, 3) NLP-based assessment of written responses, 4) Video interview analysis for communication and soft skills, 5) Proctoring and plagiarism detection, 6) Automated scoring and ranking, 7) Integration with ATS for candidate tracking, 8) Candidate feedback and benchmarking, 9) Analytics on assessment validity and predictive power, 10) Continuous question bank updating and calibration.